The number of dead cape fur seals discovered washed ashore Namibia's Pelican Point Beach in the coastal town of Walvis Bay has risen to more than 7,000 with the numbers also including female adults, Marine Biologist said Monday.

According to Ocean Conservation Namibia (OCN) Marine Biologist, Naude Dryer, they have been seeing a lot more dead female adults than seal pups but the cause of death is still unknown.

"We are trying our best to find answers given the complex nature of the investigations where we do not even know what we are looking for," he said.

Previously Dreyer said he suspected the seals are aborting because of different reasons which include toxins, diseases or starvation because fish might have moved far away from where the seals live.

He said the seals looked a bit thin and that could likely happen due to lack of food.

Meanwhile the organization has opened a "Go Fund Me" page to raise money for investigations into what is causing the deaths.